Why do nations form alliances?

What lands were added to the russian empire under ivan iv, peter the great, and catherine the great?

Based on new mexico's transition from territory to statehood, which conclusions is best supported? a) hispanic's had litte interest in being part of the united states b) white americans distrusted those who were not like them c) native americans did not have voting rights in the united states d) president william h. taft was a native of new mexico

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.